Creating Multus networks

Red Hat OpenShift Container Platform uses the Multus CNI plug-in to allow chaining of CNI plug-ins. During cluster installation, you can configure your default pod network. The default network handles all ordinary network traffic for the cluster.

You can define an extra network based on the available CNI plug-ins and attach one or more of these networks to your pods. To attach more network interfaces to a pod, you must create configurations that define how the interfaces are attached.

You specify each interface by using a NetworkAttachmentDefinition custom resource (CR). A CNI configuration inside each of the NetworkAttachmentDefinition defines how that interface is created.

Fusion Data Foundation uses the CNI plug-in called macvlan. Creating a macvlan-based additional network allows pods on a host to communicate with other hosts and pods on those hosts by using a physical network interface. Each pod that is attached to a macvlan-based additional network is provided a unique MAC address.